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  1. rbalex

    Class II Div 2 Equipment

    For what it's worth, Type 12 isn't for hazardous locations either. In fact, Table 110.28 identifies it as an indoor enclosure. Throughout Articles 500 to 503, various General Purpose (UL calls them "Ordinary Location" as opposed to "Hazardous Location") enclosures are recognized as suitable...
  2. rbalex

    Class II Div 2 Equipment

    I am assuming you have read NEC Section 502.10(B) carefully. Subsections 502.10(B)(1),(2),and(3) cover acceptable wiring methods. Subsection 502.10(B)(4) specifically states that enclosures shall be dusttight. If you read the Notes to Table 110.28, you will discover that there are several...
  3. rbalex

    LBs for hazardous location between sealoffs

    From Section 501.10(A)(3) Boxes and Fittings. All boxes and fittings shall be approved for Class I, Division 1. A fitting (LB) that is only identified as Type 4 is not sufficient for Division 1.
  4. rbalex

    Interpretation of NEC Code for Conduit Seals in Div 2 areas

    My interpretation of Section 501.15(A)(1)(2) may be misleading. I should have said something like IF 501.15(A)(1)(1) doesn't already apply THEN where the conduit entry is less than 2" OR only contains "terminals, splices, or taps", the enclosure is NOT required to be sealed, even though it is...
  5. rbalex

    Interpretation of NEC Code for Conduit Seals in Div 2 areas

    I don't want to confuse the issue more, but I don't know what the reference to "'exhibit 501.17' on the same page" refers to. I couldn't find an antecedent reference in your previous or current posts. By the way, I am citing the 2011 NEC. This may seem convoluted, but we may as well begin as...
  6. rbalex

    Interpretation of NEC Code for Conduit Seals in Div 2 areas

    1) In Division 2, simply using an explosionproof enclosure does not necessarily require it to be one. Seals are not necessary if the equipment isn't required to be explosionproof. 2) This is correct conceptually, but is more based on whether equipment described in Article 501, Part III...
  7. rbalex

    Hazardous Location Classification Question - Class I Div 2

    Unless an application is within the scopes of Articles 511 - 516, it is virtually impossible to classify a location from the NEC alone. You need to refer to one of the Standards in the Fine Print or Informational Notes (FPN/IN) listed in Section 500.4(B); particularly FPN/IN No.4. The most...
  8. rbalex

    Offshoring, outsourcing, inshoring, reshoring, Where are we really headed?

    Tagalog or Hindi would have been even better. My former employers (I'm retired) availed themselves of these "high value" design centers. I want to make clear these engineers/designers were NOT stupid, but very unfamiliar, especially if US domestic standards were required. For a long time...
  9. rbalex

    Loher Motor... Ex?

    Since "explosionproof” is typically an NEC, “Division” term, I will tell you that, if the only mark on the motor is E Exe II, it is not explosionproof. While DRWeig is correct saying “Ex d” is closer, it still isn’t explosionproof; it is IEC “flameproof”. While they are similar in concept, they...
  10. rbalex

    Motors in Explosion Proof (CL1 Div2) Areas

    See NEC Section 430.7(A)(5). The motor's "rated temperature rise or the insulation system class and rated ambient temperature" will be marked on the nameplate. A T3 "T Code" implies an acceptable temperature of 160C [200c x .8]. That's still above boiling water. No conventional motor will run...
  11. rbalex

    Off Shore Drilling Now Requires Extensive PE Oversight

    Interestingly enough, PEs (usually electrical, but occasionally others) are not required to create/review/approve electrical area classification by FedOSHA unless it is to NEC "Zone" standards and the NEC has removed the requirement for PE review altogether in Article 505. Offshore rigs have a...
  12. rbalex

    NEC 110.26 Workig Clearance Requirements

    Section 110.26(C)(2)(b) applies to either or both switchgears where 110.26(A)(1), Condition 3 exists. That is, only one of them must be 1200A or greater since it alone still must have entrance/egress from the workspace at each end or meet 110.26(C)(2)(b). [110.26(C)(2)(a) is virtually impossible...
  13. rbalex

    Other conduit sealing compounds?

    Generally no. See NEC Section 501.15(C)(1). It may not be immediately obvious but it is the fittings that are primarily "listed" and most seal manufacturers have their products listed with their own proprietary sealing compound. In other words, if a compound manufacturer claims their product is...
  14. rbalex

    Earthing

    If you bond and ground things properly, the grounding electrode system shouldn't see much fault current either. Fault currents should bypass the grounding electrode system via the equipment grounding conductors. The grounding electrode system may see lightning strike currents or step & touch...
  15. rbalex

    State of California denies non-civil PEs the right to practice enginee

    From the California Professional Engineers Act: (All underlines mine) You are “professing” to be a mechanical engineer simply by using the title.
  16. rbalex

    State of California denies non-civil PEs the right to practice enginee

    Essentially he is. I routinely design/seal hazardous location documents. It isn't rocket science, but it isn't trivial either. Most Chem Es could pick it up easily. Most CEs could too, but probably aren't interested.
  17. rbalex

    State of California denies non-civil PEs the right to practice enginee

    As a "Practice Act" California PE for over 35 years, I agree it's long overdue to let PEs perform in their own area of competence.
  18. rbalex

    E-Stop Push-Button Implementation ???

    There are a few operations such as motor fuel dispensing (NEC Art 514) and Elevators (NEC Art 620) that do require emergency shutdowns; however, other than being "reliable" there are no specifications for implementation. For process control you might want to consider API RP 540. It is neither...
  19. rbalex

    How long is an Engineer liable for the design of a structure?

    Another to ask (although I agree you need legal counsel) is your liability insurance carrier. Your lawyer has no direct liability - the insurance carrier does. If you have no insurance or employer indemnificaction, you have a big problem no matter what state you're in.
  20. rbalex

    What codes are required for the design of household equipment

    The NEC does not generally specify requirements for appliances; however, Annex A has a non-mandatory “…list of product safety standards used for product listing where that listing is required by this Code.” Unless it is a local mandate, not all products are required to be listed.

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